<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Timeout.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Timeout</span> <a name="line-2"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Manager</span> <a name="line-3"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Handle</span> <a name="line-4"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>initialize</span> <a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>register</span> <a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>registerKillThread</span> <a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tickle</span> <a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pause</span> <a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>resume</span> <a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>cancel</span> <a name="line-11"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-12"></a> <a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>I</span> <a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span> <span class='hs-layout'>(</span><span class='hs-varid'>forkIO</span><span class='hs-layout'>,</span> <span class='hs-varid'>threadDelay</span><span class='hs-layout'>,</span> <span class='hs-varid'>myThreadId</span><span class='hs-layout'>,</span> <span class='hs-varid'>killThread</span><span class='hs-layout'>)</span> <a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>forever</span><span class='hs-layout'>)</span> <a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>E</span> <a name="line-17"></a> <a name="line-18"></a><span class='hs-comment'>-- FIXME implement stopManager</span> <a name="line-19"></a> <a name="line-20"></a><a name="Manager"></a><span class='hs-comment'>-- | A timeout manager</span> <a name="line-21"></a><a name="Manager"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Manager</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Manager</span> <span class='hs-layout'>(</span><span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Handle</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-22"></a><a name="Handle"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Handle</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>State</span><span class='hs-layout'>)</span> <a name="line-23"></a><a name="State"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>State</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Active</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Inactive</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Paused</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Canceled</span> <a name="line-24"></a> <a name="line-25"></a><a name="initialize"></a><span class='hs-definition'>initialize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Manager</span> <a name="line-26"></a><span class='hs-definition'>initialize</span> <span class='hs-varid'>timeout</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-27"></a> <span class='hs-varid'>ref</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span> <a name="line-28"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>forkIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>forever</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-29"></a> <span class='hs-varid'>threadDelay</span> <span class='hs-varid'>timeout</span> <a name="line-30"></a> <span class='hs-varid'>ms</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>ref</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-31"></a> <span class='hs-varid'>ms'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>go</span> <span class='hs-varid'>ms</span> <span class='hs-varid'>id</span> <a name="line-32"></a> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>ref</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>ms'</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-33"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Manager</span> <span class='hs-varid'>ref</span> <a name="line-34"></a> <span class='hs-keyword'>where</span> <a name="line-35"></a> <span class='hs-varid'>go</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>front</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>front</span> <a name="line-36"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Handle</span> <span class='hs-varid'>onTimeout</span> <span class='hs-varid'>iactive</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-varid'>front</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-37"></a> <span class='hs-varid'>state</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>iactive</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>go'</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-38"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>state</span> <span class='hs-keyword'>of</span> <a name="line-39"></a> <span class='hs-conid'>Inactive</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-40"></a> <span class='hs-varid'>onTimeout</span> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span><span class='hs-varop'>`</span> <span class='hs-varid'>ignoreAll</span> <a name="line-41"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>rest</span> <span class='hs-varid'>front</span> <a name="line-42"></a> <span class='hs-conid'>Canceled</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-varid'>rest</span> <span class='hs-varid'>front</span> <a name="line-43"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-varid'>rest</span> <span class='hs-layout'>(</span><span class='hs-varid'>front</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <a name="line-44"></a> <span class='hs-varid'>go'</span> <span class='hs-conid'>Active</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Inactive</span> <a name="line-45"></a> <span class='hs-varid'>go'</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <a name="line-46"></a> <a name="line-47"></a><a name="ignoreAll"></a><span class='hs-definition'>ignoreAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>SomeException</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-48"></a><span class='hs-definition'>ignoreAll</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <a name="line-49"></a> <a name="line-50"></a><a name="register"></a><span class='hs-definition'>register</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Manager</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Handle</span> <a name="line-51"></a><span class='hs-definition'>register</span> <span class='hs-layout'>(</span><span class='hs-conid'>Manager</span> <span class='hs-varid'>ref</span><span class='hs-layout'>)</span> <span class='hs-varid'>onTimeout</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-52"></a> <span class='hs-varid'>iactive</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>newIORef</span> <span class='hs-conid'>Active</span> <a name="line-53"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Handle</span> <span class='hs-varid'>onTimeout</span> <span class='hs-varid'>iactive</span> <a name="line-54"></a> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>ref</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span> <span class='hs-conop'>:</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-55"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>h</span> <a name="line-56"></a> <a name="line-57"></a><a name="registerKillThread"></a><span class='hs-definition'>registerKillThread</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Manager</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Handle</span> <a name="line-58"></a><span class='hs-definition'>registerKillThread</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-59"></a> <span class='hs-varid'>tid</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>myThreadId</span> <a name="line-60"></a> <span class='hs-varid'>register</span> <span class='hs-varid'>m</span> <span class='hs-varop'>$</span> <span class='hs-varid'>killThread</span> <span class='hs-varid'>tid</span> <a name="line-61"></a> <a name="line-62"></a><a name="tickle"></a><span class='hs-definition'>tickle</span><span class='hs-layout'>,</span> <span class='hs-varid'>pause</span><span class='hs-layout'>,</span> <span class='hs-varid'>resume</span><span class='hs-layout'>,</span> <span class='hs-varid'>cancel</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-63"></a><span class='hs-definition'>tickle</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>iactive</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>writeIORef</span> <span class='hs-varid'>iactive</span> <span class='hs-conid'>Active</span> <a name="line-64"></a><a name="pause"></a><span class='hs-definition'>pause</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>iactive</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>writeIORef</span> <span class='hs-varid'>iactive</span> <span class='hs-conid'>Paused</span> <a name="line-65"></a><a name="resume"></a><span class='hs-definition'>resume</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tickle</span> <a name="line-66"></a><a name="cancel"></a><span class='hs-definition'>cancel</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>iactive</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>writeIORef</span> <span class='hs-varid'>iactive</span> <span class='hs-conid'>Canceled</span> </pre></body> </html>
